ZhangJiaGang Antron Machinery,Co.,Ltd

Plastic machinery application classification

Plastic machinery application classification

Blowing Machine
The film blowing machine heats and melts the plastic particles and then blows them into a film.

There are many types of film blowing machines, including PE, POF, and so on.

The new material is blown out with brand-new particles, the color is uniform, clean, and the bag stretches well.

Some people use recycled plastic bags to make particles. This kind of particles are generally called old materials. When they are made into particles, they are usually gray. When making bags, pigments are usually added. The bags are unevenly colored, brittle and easy to break. , The price is also lower.

Although it is a recycled plastic bag, there is still a big difference between the waste bag in the bag making process and the garbage plastic in the usual sense.

composition

The film blowing machine consists of nine parts: ① motor, ② cylinder, ③ head, ④ dies, ⑤ v board, ⑥ counter wheel, ⑦ smooth wheel, ⑧ counter wheel 2, ⑨ wind

The temperature of raw materials LLDPE and LDPE is 160-180 degrees

HDPE temperature is 210-230 degrees

The most important factors in the work of the film blowing machine are three factors

One temperature (machine temperature, indoor temperature)

Double helix

Three cooling system

application

The film blowing machine produces film suitable for all kinds of high-end film packaging. This kind of film can be widely used in light and heavy packaging due to its good barrier properties, freshness preservation, moisture proof, frost proof, oxygen barrier and oil resistance. Such as various fresh fruits, meat products, pickles, fresh milk, liquid beverages, medical supplies, etc.

Calender
In plastic machinery, the calender is usually combined with pilot devices such as material conveying, screening, metering, kneading and plasticizing, and subsequent devices such as separation, traction, embossing, cooling, thickness measurement, coiling, and cutting, as well as transmission, monitoring and heating. Devices and other equipment constitute a complete calendering production line to produce soft and hard films, sheets, artificial leather, wallpaper and floor coverings and other products.

There are many types of calenders in plastic machinery. The number of pressing rollers is divided into two rollers, three rollers, four rollers and five rollers. The arrangement of pressing rollers can be divided into F, Z, S and L types.

Different from other plastic machinery, the calender is composed of a frame, a pressure roller and its adjusting device, a transmission system and a heating system (Figure 10 plastic calender). The frame is usually made of cast iron and is directly installed on both sides of the cast iron or cast steel frame to support the roller bearings, cross-shaft or roller pre-bending device, roller adjusting device, lubricating device and other auxiliary devices. The pressure roller is made of chilled cast iron and cast steel, and its aspect ratio is selected according to the bending strength of the pressure roller material, which is about 2.6~3.5. In order to compensate for the uneven thickness of the product caused by the bending deformation of the pressure roller, the pressure roller is mostly made into a waist drum shape, and the roller cross device and the roller pre-bending device can also be used to eliminate the uneven thickness of the product. Each pressure roller is driven by a separate motor. Steam or superheated water is generally used for the heating of the pressure roller, and the temperature difference between the two ends is required to not exceed 1°C. Each pressure roller has an independent automatic heating system. Modern calenders use roller bearings instead of traditional sliding bearings to save energy, improve bearing life and product thickness accuracy.

According to the different calender specifications, the thickness of the soft PVC film produced is also different, ranging from 50 to 1000m, and the minimum thickness of the hard PVC film is 60m.

Internal mixer
The full name is a closed plastic mixing machine. It is one of the main equipment for plastic compounding. According to the working principle, it can be divided into two types: intermittent and continuous. The main structural parameters of the internal mixer are the rotor speed, diameter, length and the total capacity of the internal mixer. Figure 1 shows the structure of an oval rotor type batch internal mixer. It consists of a mixing chamber, a rotor, an upper top bolt (pressing device), a lower top bolt (discharging device), a heating and cooling device, and a transmission system. Its working principle is: the mixture enters the mixing chamber from the feeding hopper, and is subjected to constantly changing shearing and kneading in the gap between the two relatively rotating rotors, the gap between the rotor and the inner wall of the mixing chamber, and the gap between the rotor and the upper and lower top bolts. Refining and friction make the plastic heat and plasticize and mix evenly. Intermittent internal mixers have tended to be standardized and serialized. Commercially available internal mixers have specifications such as 4, 25, 50, 75, 150, 250, and 380l according to the total capacity. Since batch internal mixers are not suitable for continuous production, continuous internal mixers were developed in the 1960s. The more commonly used are rotor type continuous internal mixer and twin screw mixer. There are many types of twin-screw mixers. Generally, it has the ability of forced conveying of materials, strong mixing function, short residence time of materials in the twin screw, and good self-cleaning performance of the twin screw, which can eliminate material accumulation in time and reduce material degradation, so the application is becoming more and more popular. Figure 2 shows the twin-screw mixing and pelletizing machine.

Thermoforming machine
There are basically two types of molding machines used for thermoplastic sheets: roll-feeding type and single-sheet feeding type. The sheet and roll feed type thermoforming machine feeds the roll-shaped sheet material, or directly connects with the sheet extruder to form an assembly line. The single-sheet feed type thermoforming machine is named after the pre-cut sheet material that is fed in.

The continuous roll-feed thermoforming machine (Figure 11) is quite popular. It can produce high-quality products at high speed and supply them in accordance with the specifications of the mold. The most popular ones are 60×60, 90×90, 125×106cm and other specifications. This type of thermoforming machine is often designed with a furnace whose length is 3 to 4 times the size of the longest mold. Most heating furnaces are electrically heated and are installed on racks that can be removed from the sheet conveying system. There are two main types of ovens: C-frame type and drop-door type. Thermoforming systems are mostly hydraulically or mechanically driven. Single-chip feed thermoforming machines can be divided into two types: rotary type and shuttle type (Figure 12). Rotary thermoforming machines are often used for mass production of products. The common three-station standard thermoforming machine has a rotation of 120°; there are also four-station thermoforming machines, that is, a heating station is added. The shuttle thermoforming machine has a forming station, the sheet material is clamped on the clamping frame, and then reciprocating above the heating furnace. It is also designed as a double-station thermoforming machine composed of two forming stations and one oven. The processing adaptability of this type of thermoforming machine is wide.
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